Isotopes (δD and δ18O) in precipitation, groundwater and surface water in the Ordos Plateau, China: implications with respect to groundwater recharge and circulation
Isotopes (δD and δ18O) in precipitation, groundwater and surface water in the Ordos Plateau, China: implications with respect to groundwater recharge and circulation
复制标题
DOI：
10.1007/s10040-010-0671-4
复制
发表时间：
2011-03
影响因子：
2.8
通讯作者：
L. Yin;G. Hou;X. Su;Dong Wang;J. Dong;Y. Hao;Xiaoyong Wang
中科院分区：
文献类型：
--
作者：
L. Yin;G. Hou;X. Su;Dong Wang;J. Dong;Y. Hao;Xiaoyong Wang
利用降水、地下水和地表水中δ D和δ 18O的特征，研究了鄂尔多斯高原地下水流系统。局地大气降水线（LMWL）的斜率小于全球大气降水线（GMWL）的斜率，表明降水过程中存在二次蒸发。降水稳定同位素的分布受温度和降水量的影响。湖水由于蒸发作用而同位素富集，其同位素组成与补给来源和在地下水流系统中的位置密切相关。河水同位素富集，表明它遭受蒸发。深层地下水（超过150米）的重同位素相对于浅层地下水（小于150米）的亏损，这表明深层地下水可能在晚更新世和全新世早期，当气候比现在更潮湿和寒冷的补充。所有地下水样品都分布在LMWL附近，这意味着地下水是大气降水的来源。浅层地下水经历蒸发，平均蒸发损失为53%。有两种补给机制：优先流，蒸发的土壤水分和随后的降雨的混合物。
The characteristics of δD and δ18O in precipitation, groundwater and surface water have been used to understand the groundwater flow system in the Ordos Plateau, north-central China. The slope of the local meteoric water line (LMWL) is smaller than that of the global meteoric water line (GMWL), which signifies secondary evaporation during rainfall. The distribution of stable isotopes of precipitation is influenced by temperature and the amount of precipitation. The lake water is enriched isotopically due to evaporation and its isotopic composition is closely related to the source of recharge and location in the groundwater flow systems. River water is enriched isotopically, indicating that it suffers evaporation. The deep groundwater (more than 150 m) is depleted in heavy isotopes relative to the shallow groundwater (less than 150 m), suggesting that deep groundwater may have been recharged during the late Pleistocene and early Holocene, when the climate was wetter and colder than at present. All groundwater samples plot around the LMWL, implying groundwater is of meteoric origin. Shallow groundwater has undergone evaporation and the average evaporation loss is 53%. There are two recharge mechanisms: preferential flow, and the mixture of evaporated soil moisture and subsequent rain.